Add a VM ioctl to get a statistics file descriptor by which a read
functionality is provided for userspace to read out VM stats header,
descriptors and data.
Define VM statistics descriptors and header for all architectures.
Reviewed-by: David Matlack <dmatlack@xxxxxxxxxx>
Reviewed-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Reviewed-by: Fuad Tabba <tabba@xxxxxxxxxx>
Tested-by: Fuad Tabba <tabba@xxxxxxxxxx> #arm64
Signed-off-by: Jing Zhang <jingzhangos@xxxxxxxxxx>
---
arch/arm64/kvm/guest.c | 14 +++++++++++++
arch/mips/kvm/mips.c | 14 +++++++++++++
arch/powerpc/kvm/book3s.c | 16 +++++++++++++++
arch/powerpc/kvm/booke.c | 16 +++++++++++++++
arch/s390/kvm/kvm-s390.c | 19 +++++++++++++++++
arch/x86/kvm/x86.c | 24 ++++++++++++++++++++++
include/linux/kvm_host.h | 6 ++++++
virt/kvm/kvm_main.c | 43 +++++++++++++++++++++++++++++++++++++++
8 files changed, 152 insertions(+)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 4962331d01e6..f456d1defe2b 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -28,6 +28,20 @@
#include "trace.h"
+struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS()
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_LEN,
+ .count = ARRAY_SIZE(kvm_vm_stats_desc),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index ff205b35719b..a1c6b9c5a4ae 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -38,6 +38,20 @@
#define VECTORSPACING 0x100 /* for EI/VI mode */
#endif
+struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS()
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_LEN,
+ .count = ARRAY_SIZE(kvm_vm_stats_desc),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("wait", wait_exits),
VCPU_STAT("cache", cache_exits),
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 92cdb4175945..d3dfdddb4f7d 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -38,6 +38,22 @@
/* #define EXIT_DEBUG */
+struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS(),
+ STATS_DESC_ICOUNTER(VM, num_2M_pages),
+ STATS_DESC_ICOUNTER(VM, num_1G_pages)
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_LEN,
+ .count = ARRAY_SIZE(kvm_vm_stats_desc),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("exits", sum_exits),
VCPU_STAT("mmio", mmio_exits),
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 80d3b39aa7ac..4e4a58b19487 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -36,6 +36,22 @@
unsigned long kvmppc_booke_handlers;
+struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS(),
+ STATS_DESC_ICOUNTER(VM, num_2M_pages),
+ STATS_DESC_ICOUNTER(VM, num_1G_pages)
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_LEN,
+ .count = ARRAY_SIZE(kvm_vm_stats_desc),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("mmio", mmio_exits),
VCPU_STAT("sig", signal_exits),
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index e8bc7cd06794..89c0a2722183 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -58,6 +58,25 @@
#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
(KVM_MAX_VCPUS + LOCAL_IRQS))
+struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS(),
+ STATS_DESC_COUNTER(VM, inject_io),
+ STATS_DESC_COUNTER(VM, inject_float_mchk),
+ STATS_DESC_COUNTER(VM, inject_pfault_done),
+ STATS_DESC_COUNTER(VM, inject_service_signal),
+ STATS_DESC_COUNTER(VM, inject_virtio)
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_LEN,
+ .count = ARRAY_SIZE(kvm_vm_stats_desc),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("userspace_handled", exit_userspace),
VCPU_STAT("exit_null", exit_null),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 157212157aee..a461d9d79865 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -223,6 +223,30 @@ EXPORT_SYMBOL_GPL(host_xss);
u64 __read_mostly supported_xss;
EXPORT_SYMBOL_GPL(supported_xss);
+struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS(),
+ STATS_DESC_COUNTER(VM, mmu_shadow_zapped),
+ STATS_DESC_COUNTER(VM, mmu_pte_write),
+ STATS_DESC_COUNTER(VM, mmu_pde_zapped),
+ STATS_DESC_COUNTER(VM, mmu_flooded),
+ STATS_DESC_COUNTER(VM, mmu_recycled),
+ STATS_DESC_COUNTER(VM, mmu_cache_miss),
+ STATS_DESC_ICOUNTER(VM, mmu_unsync),
+ STATS_DESC_ICOUNTER(VM, lpages),
+ STATS_DESC_ICOUNTER(VM, nx_lpage_splits),
+ STATS_DESC_ICOUNTER(VM, max_mmu_page_hash_collisions)
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_LEN,
+ .count = ARRAY_SIZE(kvm_vm_stats_desc),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_ID_MAXLEN +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("pf_fixed", pf_fixed),
VCPU_STAT("pf_guest", pf_guest),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2f0d12064ae7..4c73bc761f96 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -599,6 +599,7 @@ struct kvm {
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
struct notifier_block pm_notifier;
#endif
+ char stats_id[KVM_STATS_ID_MAXLEN];
};
#define kvm_err(fmt, ...) \
@@ -1427,11 +1428,16 @@ struct _kvm_stats_desc {
STATS_DESC_INSTANT(SCOPE, name, KVM_STATS_UNIT_SECONDS, \
KVM_STATS_BASE_POW10, -9)
+#define KVM_GENERIC_VM_STATS() \
+ STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush)
+
extern struct kvm_stats_debugfs_item debugfs_entries[];
extern struct dentry *kvm_debugfs_dir;
ssize_t kvm_stats_read(char *id, struct kvm_stats_header *header,
struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
char __user *user_buffer, size_t size, loff_t *offset);
+extern struct kvm_stats_header kvm_vm_stats_header;
+extern struct _kvm_stats_desc kvm_vm_stats_desc[];
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cec986487b30..cf0d487272b9 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4055,6 +4055,46 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
}
}
+static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
+ size_t size, loff_t *offset)
+{
+ struct kvm *kvm = file->private_data;
+
+ return kvm_stats_read(kvm->stats_id, &kvm_vm_stats_header,
+ &kvm_vm_stats_desc[0], &kvm->stat,
+ sizeof(kvm->stat), user_buffer, size, offset);
+}
+
+static const struct file_operations kvm_vm_stats_fops = {
+ .read = kvm_vm_stats_read,
+ .llseek = noop_llseek,
+};
+
+static int kvm_vm_ioctl_get_stats_fd(struct kvm *kvm)
+{
+ int fd;
+ struct file *file;
+
+ fd = get_unused_fd_flags(O_CLOEXEC);
+ if (fd < 0)
+ return fd;
+
+ file = anon_inode_getfile("kvm-vm-stats",
+ &kvm_vm_stats_fops, kvm, O_RDONLY);
+ if (IS_ERR(file)) {
+ put_unused_fd(fd);
+ return PTR_ERR(file);
+ }
+ file->f_mode |= FMODE_PREAD;
+ fd_install(fd, file);
+
+ /* Fill the stats id string */
+ snprintf(kvm->stats_id, sizeof(kvm->stats_id),
+ "kvm-%d", task_pid_nr(current));
+
+ return fd;
+}
+
static long kvm_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -4237,6 +4277,9 @@ static long kvm_vm_ioctl(struct file *filp,
case KVM_RESET_DIRTY_RINGS:
r = kvm_vm_ioctl_reset_dirty_pages(kvm);
break;
+ case KVM_GET_STATS_FD:
+ r = kvm_vm_ioctl_get_stats_fd(kvm);
+ break;
default:
r = kvm_arch_vm_ioctl(filp, ioctl, arg);
}
--
2.32.0.288.g62a8d224e6-goog
